Eye Relief Question

My Primary Arms 2.5x prism came today. They are talking about 2.67 inches of eye relief. Does this mean measure the distance from the eye to the rear of the scope and set the scope 2.67 inches? If this is not an accurate interpretation, what would you recommend?

yes, it's the distance from your pupil to the back of the lens for full field of view.

Thanks. I think it is all worked out now.